Geometry of numerical ranges in locally -convex *-algebras.
Geometry of oblique projections
Let A be a unital C*-algebra. Denote by P the space of selfadjoint projections of A. We study the relationship between P and the spaces of projections determined by the different involutions induced by positive invertible elements a ∈ A. The maps sending p to the unique with the same range as p and sending q to the unitary part of the polar decomposition of the symmetry 2q-1 are shown to be diffeomorphisms. We characterize the pairs of idempotents q,r ∈ A with ||q-r|| < 1 such that...
Geometry of some simple nonlinear differential operators
Geometry of the energy functional and the Fredholm alternative for the -Laplacian in higher dimensions.
Geometry of the spectral semidistance in Banach algebras
Let be a unital Banach algebra over , and suppose that the nonzero spectral values of and are discrete sets which cluster at , if anywhere. We develop a plane geometric formula for the spectral semidistance of and which depends on the two spectra, and the orthogonality relationships between the corresponding sets of Riesz projections associated with the nonzero spectral values. Extending a result of Brits and Raubenheimer, we further show that and are quasinilpotent equivalent if...
Ger-type and Hyers--Ulam stabilities for the first-order linear differential operators of entire functions.
Gestörte Verzweigung bei Potentialoperatoren.
Gewöhnliche Differentialgleichungen für Erzeugende gewisser Bergman-Operatoren.
Gleason measures and some inner products on the algebra of bounded operators on a Hilbert space
Global analysis for a two-dimensional elliptic eigenvalue problem with the exponential nonlinearity
Global asymptotic stability of inhomogeneous iterates.
Global behavior of the components for the second order -point boundary value problems.
Global bifurcation from the Fučik spectrum
Global bounds for cocoercive variational inequalities.
Global Existence and Boundedness of Solutions to a Model of Chemotaxis
A model of chemotaxis is analyzed that prevents blow-up of solutions. The model consists of a system of nonlinear partial differential equations for the spatial population density of a species and the spatial concentration of a chemoattractant in n-dimensional space. We prove the existence of solutions, which exist globally, and are L∞-bounded on finite time intervals. The hypotheses require nonlocal conditions on the species-induced production of the chemoattractant.
Global existence and nonexistence for semiliniear parabolic systems with nonlinear boundary conditions.
Global Existence and Stability for Neutral Functional Evolution Equations with State-Dependent Delay
In this paper we prove the global existence and attractivity of mild solutions for neutral semilinear evolution equations with state-dependent delay in a Banach space.
Global existence for a Riccati equation arising in a boundary control problem for distributed parameters
Si prova resistenza globale della soluzione di una equazione di Riccati collegata alla sintesi di un problema di controllo ottimale. Il problema considerato rappresenta la versione astratta di alcuni problemi governati da equazioni paraboliche con il controllo sulla frontiera.
Global existence for a semilinear prabolic Volterra equation.
Global existence for coupled Klein-Gordon equations with different speeds
Consider, in dimension 3, a system of coupled Klein-Gordon equations with different speeds, and an arbitrary quadratic nonlinearity. We show, for data which are small, smooth, and localized, that a global solution exists, and that it scatters. The proof relies on the space-time resonance approach; it turns out that the resonant structure of this equation has features which were not studied before, but which are generic in some sense.